Gene therapy first saves boy
	Scientists at Great Ormond Street Hospital in London successfully treated 18-month-old Rhys Evans, who had a condition preventing him from developing an immune system. The BBC's Karen Allen reports.

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	Rhys Evans' consultant Dr Adrian Thrasher: "We know what the genetic defect in his bone marrow is"
	Professor Christine Kinnon, Great Ormond Street: "There are other immune diseases which will be applicable to this treatment"